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D( x )
x+138 = 0
x+138 = 0
x+138 = 0
x+138 = 0 // - 138
x = -138
x in (-oo:-138) U (-138:+oo)
x/(x+138) = 0.6 // - 0.6
x/(x+138)-0.6 = 0
x/(x+138)+(-0.6*(x+138))/(x+138) = 0
x-0.6*(x+138) = 0
0.4*x-82.8 = 0
(0.4*x-82.8)/(x+138) = 0
(0.4*x-82.8)/(x+138) = 0 // * x+138
0.4*x-82.8 = 0
0.4*x-82.8 = 0 // + 82.8
0.4*x = 82.8 // : 0.4
x = 82.8/0.4
x = 207
x = 207
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